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Derivative Instruments - Credit Risk and Credit-Risk-Related Contingent Feature (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) institution | Dec. 31, 2017 USD ($)
Derivative [Line Items] |  |
Derivative asset | $ 41,341 | $ 48,186
Fair value of derivative assets | 41,341 | 48,186
Derivative liability | $ 14,895 | 13,848
Moody's, Aa3 Rating |  |
Derivative [Line Items] |  |
Number of financial institutions company does transactions with | institution | 1 |
Moody's, A1 Rating |  |
Derivative [Line Items] |  |
Number of financial institutions company does transactions with | institution | 4 |
Moody's, A3 Rating |  |
Derivative [Line Items] |  |
Number of financial institutions company does transactions with | institution | 1 |
Derivatives designated as hedging instruments: | Interest rate swaps |  |
Derivative [Line Items] |  |
Fair value of derivative assets | $ 12,733 | $ 6,046

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